Muffler



Nov. 10, 1936. H. s. POWELL MUFFLER Filed Aug. 25, 1935 l OOOOOOOeOOwOOOOOOOOOOQQOOOOOOOO 0000000000000000000000060001000 L m0000000 wwoww@ hl n 0 00000000060 200:@` doom@ Mwdbdwwwdb.. .1

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L 0000000 ,WWWWWWW OOOOOOOQOOHOL .OOOOOOOOOO Patented Nov. 10, 1936 UNITED STATES PATENT OFFIE 5 Claims.

This invention relates to improvements in muillers of the type used for silencing the exhaust of an internal combustion engine.

One of the features of the present device is the provision of parts constituting a very simple, easily manufactured and assembled, and strong structure.

Another feature of the present invention is the provision of such a device with inlet and outlet tubes which are provided with apertures along their lengths and extend through a plurality of compartments in a casing, the gases passing from the inlet tube into the respective compartments and thence into the outlet tube, together with means for establishing a direct passage from the inlet to the outlet tube of a determined quantity of these gases.

With these and other features as objects in view, illustrative forms of practicing the invention are shown on the accompanying drawing, in which:

Fig. 1 is a longitudinal view, with parts of the outer casing broken away.

Fig. 2 is a view of the inlet end.

Fig. 3 is a cross-sectional View substantially on line 3-3 of Fig. 1.

Fig. 4 is a view corresponding to Fig. 3, of a modified form of construction.

Fig. 5 is a View of the outlet end.

In the drawing, the outer casing I0 is illustrated as of cylindrical shape and having secured flXedly therein the end members or heads Il and I2. An inlet tube I3 extends through the inlet head II and abuts against the outlet head I2 after having passed for the length of the casing I0 in a direction parallel to the axis thereof, so that the tube is open at one end for the reception of the gases to be quieted and is closed at its other end.

Similarly, an outlet tube I4 passes through the outlet head I2 and after traversing the casing has its inner end substantially closed by the inlet head II.

Each of these tubes is provide-d, between the heads II and I2, with a large number of apertures I5 which serve for establishing communication between the interior of each of the tubes and the interior of the casing.

The internal space of the casing is divided into a plurality of juxtaposed compartments by partitions I6, I'I, I8 which are apertured sufciently for the passage of the tubes I3 and I4, preferably being formed with flanges I9 which closely fit the tubes and prevent the direct passage of gases from one compartment to another` Thus, the gases are compelled to issue from the` apertures I5 of the inlet tube I3 into the space of a particular compartment, and then to move from this compartment space through the apertures I5 into the outlet tube I4. It is to be noted that the apertures in the inlet tube and in the outlet tube establish communication between these tubes and each of the compartments which, as stated above, are arranged side by side.

Further, the inlet tube is connected to the outlet tube by a direct connection 20 which is shown in Fig. 3 as comprised of arcuate Walls providing a conduit directly from the inlet tube I3 into the outlet tube I4. Preferably, the crosssection of this direct connection is such as to transfer from 20% to 25% of the gases from the inlet to the outlet tube. It will be understood that this connection may be located at various points along the length of the tubes, but preferably leads from a point of the inlet tube adjacent its gas receiving to a point of the outlet tube adjacent the closed end thereof. In this Way, a considerable quantity of the gases are passed into the outlet tube, so that the crossjets of gases entering from the compartments through apertures I5 produce the desired quieting effect in a more eficient manner than heretofore.

In the form of construction according to Fig. 4, the direct connection or cross-over conduit 20a is shown `as straight in lieu of being arcuate as in Fig. 3. It will be noted from Fig. 1 that this direct connection or cross-over conduit 20 may itself have perforations opening into the first compartment, i. e. the compartment between the inlet head II and the partition I6, in the specic illustrated form.

This construction and arrangement of muffler is very convenient for assembly and use, as the parts are simple and are adequately supported and spaced with respect to one another. The parts may be joined Xe-dly by spot-welding or otherwise.

It is obvious that the invention is not limited solely to the forms of construction shown, but that it may be modified in many ways within the scope of the appended claims.

I claim:

1. A muffler consisting of a tubular casing having end walls and transverse partitions dividing the internal space of the casing into separate compartments, an inlet tube extending from end to end of the casing and having an inlet connection through one end Wall thereof, an outlet tube extending from end to end of the casing and having an outlet connection through the other end wall thereof, each said tube having apertures establishing communication between the tube and each said compartment whereby gases may ow from the inlet tube through its apertures into the compartment and thence through apertures of the outlet tube into said outlet tube, and conduit means providing direct connection for the movement of gases from the inlet tube to the outlet tube independently of the movement through said apertures.

2. A muler as in claim 1, in which the conduit means is so proportioned in size with respect to the said apertures that it operates for passing approximately one-fourth of the total volume of the gases and is located at the first compartment adjacent said inlet connection.

3. A muffler comprising a casing having walls and partitions dividing the internal space of the casing into separate compartments, an inlet tube extending into a plurality of juxtaposed compartments and having apertures establishing communication between the tube and each compartment of said plurality, an outlet tube likewise extending into the juxtaposed compartments included in said plurality and having apertures establishing communication between each said juxtaposed compartment and the tube, and a direct connection for the movement of gases from the inlet tube to the outlet tube independently of the movement through said apertures, said direct connection being an arcuate conduit located within the casing and having apertures therein.

4. A muiiler comprising a casing having walls and partitions dividing the internal space of the casing into separate compartments, an inlet tube extending into a plurality of juxtaposed coinpartments and having apertures establishing communication between the tube and each compartment of said plurality, an outlet tube likewise extending into the juxtaposed compartments included in said plurality and having apertures establishing communication between each said juxtaposed compartment and the tube, and a direct connection for the movement of gases from the inlet tube to the outlet tube independently of the movement through said apertures, said di rect connection being a conduit located within one said compartment and comprised of walls independent of the walls of said compartment.

5. A muffler comprising a casing having partitions dividing the internal space of the casing into a plurality of compartments along the axis of the casing, substantially straight inlet and outlet tubes extending parallel to one another in the casing, each tube being substantially closed at one end, each tube having apertures within each said compartment for the passage of gases from the inlet tube into the compartment and thence into the outlet tube, and a direct connection from the point of the inlet tube adjacent its gas receiving end to a point of the outlet tube adjacent its closed end for passing approximately one-fourth of the total volume of gases.

HERBERT S. POWELL. 

